Widely shared social media posts claimed a massive underwater volcano "the size of a city" was "showing signs it could erupt ...

The volcano last erupted in 2015, producing 450-foot-thick lava flows, but because of its remote location, it is not a threat ...

The Axial Seamount volcano is located nearly a mile beneath the sea approximately 300 miles off the Oregon Coast, just west of Astoria and along the Juan de Fuca Ridge.

The area where Axial Seamount is located is the most active in the Pacific Northwest, with the volcano erupting in 2015, 2011 and 1998. Axial Seamount is also the most monitored underwater volcano.

Axial Seamount has erupted three times in the past 30 years — in 1998, 2011, and 2015. The submarine volcano isn’t the only seismic activity West Coasters may have in store.

When Axial Seamount erupted last in April 2015, scientists watched closely as about 10,000 small earthquakes signaled the start. The eruption lasted around a month, spilling lava across 25 miles ...

An underwater volcano situated 300 miles off the Oregon coast is getting closer to erupting for the first time in 10 years. The volcano, known as Axial Seamount, is formed by a hotspot in Earth's ...

The volcano, Axial Seamount, lies about a mile below the ocean's surface, about 300 miles from the coast of Astoria, Oregon.